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Effects of blade-vane ratio and rotor-stator spacing of fan noise with forward velocity

机译:前进速度对风扇噪声叶片叶片比和转子定子间距的影响

摘要

A research fan stage was acoustically tested in an anechoic wind tunnel with a 41 m/sec tunnel flow. Two stator vane numbers giving cut-on and cut-off conditions were tested at three rotor-stator spacings ranging from about 0.5 to 2.0 rotor chords. These two stators were designed for similar aerodynamic performance. Hot film anemometer turbulence measurements were made at the leading edge of the stator for each spacing. The cut-off criterion strongly controlled the fundamental tone level at all spacings. The trends with spacing of the wake defect upwash component at the stator tip showed good agreement with the corresponding cut-on acoustic tone levels.
机译:在电波速度为41 m / sec的消声风洞中对研究用风扇进行了声学测试。在给出大约0.5到2.0个转子弦的三个转子-定子间距的情况下,测试了给出导通和截止条件的两个定子叶片编号。这两个定子的设计具有相似的空气动力学性能。对于每个间距,在定子的前缘进行热膜风速计湍流测量。截止标准在所有间隔都强烈地控制了基调电平。定子尖端处的尾流缺陷上冲成分的间距趋势显示出与相应的切入声调水平良好的一致性。

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